<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allChecked"/>
    </label>
    <span> <span>已完成{{finishNum}}</span> / 全部{{todoList.length}} </span>
    <button class="btn btn-danger" @click="deleteAllFinishHandle">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props:['todoList','checkAllHandle','deleteAllFinishHandle'],
  computed:{
    allChecked:{
        get(){
          return  this.todoList.every(item => {
                return item.done
            }) && this.todoList.length !== 0
        },
        set(value){
           this.checkAllHandle(value)
        }
    },
    finishNum(){
       return this.todoList.reduce((p,c)=> {
            return c.done ? p+1 : p
        },0)
    }
  }
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>